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| author | Marcin Slusarz <marcin.slusarz@gmail.com> | 2008-11-16 19:01:44 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2009-04-02 12:29:48 +0200 |
| commit | ba9aadd80c24775e55a93ebe0c2491b4d2899257 (patch) | |
| tree | 29b8f456c6322f9a0d375bfa0a368ef4e18b0cb8 /fs/udf | |
| parent | Fix the udf code not to pass structs on stack where possible. (diff) | |
| download | linux-ba9aadd80c24775e55a93ebe0c2491b4d2899257.tar.xz linux-ba9aadd80c24775e55a93ebe0c2491b4d2899257.zip | |
udf: reduce stack usage of udf_load_pvoldesc
Allocate strings with kmalloc.
Checkstack output:
Before: udf_process_sequence: 712
After: udf_process_sequence: 200
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf')
| -rw-r--r-- | fs/udf/super.c | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index 627558213746..8364b1719158 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -902,14 +902,23 @@ static int udf_find_fileset(struct super_block *sb, static int udf_load_pvoldesc(struct super_block *sb, sector_t block) { struct primaryVolDesc *pvoldesc; - struct ustr instr; - struct ustr outstr; + struct ustr *instr, *outstr; struct buffer_head *bh; uint16_t ident; + int ret = 1; + + instr = kmalloc(sizeof(struct ustr), GFP_NOFS); + if (!instr) + return 1; + + outstr = kmalloc(sizeof(struct ustr), GFP_NOFS); + if (!outstr) + goto out1; bh = udf_read_tagged(sb, block, block, &ident); if (!bh) - return 1; + goto out2; + BUG_ON(ident != TAG_IDENT_PVD); pvoldesc = (struct primaryVolDesc *)bh->b_data; @@ -925,20 +934,25 @@ static int udf_load_pvoldesc(struct super_block *sb, sector_t block) #endif } - if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) - if (udf_CS0toUTF8(&outstr, &instr)) { - strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name, - outstr.u_len > 31 ? 31 : outstr.u_len); + if (!udf_build_ustr(instr, pvoldesc->volIdent, 32)) + if (udf_CS0toUTF8(outstr, instr)) { + strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name, + outstr->u_len > 31 ? 31 : outstr->u_len); udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident); } - if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) - if (udf_CS0toUTF8(&outstr, &instr)) - udf_debug("volSetIdent[] = '%s'\n", outstr.u_name); + if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128)) + if (udf_CS0toUTF8(outstr, instr)) + udf_debug("volSetIdent[] = '%s'\n", outstr->u_name); brelse(bh); - return 0; + ret = 0; +out2: + kfree(outstr); +out1: + kfree(instr); + return ret; } static int udf_load_metadata_files(struct super_block *sb, int partition) |